Speed-indicator.



PATENTED MAY 12, 1908.

J. G. FIELD.

SPEED INDICATOR.

APPLICATION FILED DEG. 21, 1907.

2 SHEETS-SHEET 1.

' INVENTOH J'ofuz 6.22'6 Z0? BY ww w W/ TNE SSE S A TTOHNE YS PATENTEDMAY 12, 1908.

J. G. FIELD. v SPEED INDICATOR.

APPLICATION FILED 1330.21, 1907.

2 $HEETS-SHBET 2.

INVENTOH v WITNESSES JOHN GERHARD FIELD, OF THOMPSON, IOWA.

SPEED-INDICATOR.

Specification of Letters Patent.

Patented May 12, 1908.

Application filed December 21, 1907. Serial N 0. 407,477.

T 0 all whom it may concern:

Be it known that 1, JOHN G. FIELD, a citizen of the United States, andaresident of Thompson, in the county of Winnebago and State of 'Iowa,have inventedia new and Improved Speed-Indicator, of which the followingis a full, clear, and exact description.-

This invention is an improvement in speed indicators, and has in viewthe provision of suitable mechanical means for indicating therelationshi between the speed of the device of which tl ie speed is tobe determined, and the speed of means, as a motor, moving at apredetermined velocity.

The inventionalso contem lates the provision of means for automaticallysto ping the motor when the movement of the evice being tested stops.

The invention further resides in certain novel features of constructionand combination of parts as will be hereinafter particularly describedand claimed.

Reference is to be had to the accompany ing drawings forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the views.

Figure 1 is a sectional plan substantially on the line 11 of Fig. 2, ofone embodiment of my invention; Fig. 2 is a longitudinal verticalsection through the same substantiall on the line 22 of Fig. 1, lookinin the d1- rection of the arrow Fig. 3 is a side elevation of theindicator, showing the graduated scale or dial and ointer; and Fig. 4 isa cross section substantially on the line 44 of Fig. 2, looking in thedirection of the arrow.

The working mechanism of the indicator is preferably inclosed in asuitable casing 5, having bearing-supports 6, in which a shaft 7 isjournaled, one end of the same being attached to a hand or pointer 8arran ed at the outside of the casing in a box 9, and adapted totraverse a scale or dial 10 the pointer and scale being protected by atransparent c0vering 11 forming the front of the box. Between thebearings 6 are journaled on the shaft 7, two opposed bevel gears 12 and12*, both of which are in mesh with an intermediate bevel pinion 13,oiiriialerl on the outer end of a radially-arranged shaft 14, the latterbeing rigidly secured to the shaft 7 throu h the intermediary of asegmental gear 15. T 1e gear 15 is in mesh with a rack-bar 16, slidableon suitable supports 17, arran ed at op osite sides of the bevel. gears;am is rigid y attached to a U-shap'ed frame 18 which is also slidablymounted in sup orts 19 and in the supports 6. The arms 0 the frame 18carry bearings, in which are respectively j ournaled thesupporting-shaft of a friction-wheel 20, and the" su portin -shaft 21 ofa frictionwheel 20, t e said iction-wheels contacting with the gears 12and12 respectively at the opposite sides of the shaft 7. The shaft 21 isslidably splined to the wheel 20, and is driven by any suitable meansfrom a motor 22, located in one corner of the casing, and ordinarilyspring or electrically operated. The motor embodies inits construction agear or other revoluble member 23, which, as shown, has a depression 24in one face in alinement with the reduced free end of the rack-bar 16.

In addition to the contact with the bevel gear 12 by the friction-wheel20, the latter also contacts with a gear 25, which is revolubly' mountedin the casing, and is of approximately the same diameter as the gears 12and 12 The gear 25 is driven by a pinion 26 fixed to a shaft 27, inalinement with the shaft 7, and provided exteriorly of the 'casing witha pulley 28 or other suitable means for transmitting the movement of thedevice, such as the shaft, wheel or axle, of'

which the speed is to be determined.

In the operation of the indicator, the motor 22 drives the shaft 21 andthe frictionwheel 20 at a uniform and known angular velocity, and whichin turn causes the bevel gear 12 to be set in motion at or about thesame time the device of which the speed is to be indicated, is connectedwith the pulley 28, and by reason of the intermediary mechanism revolvesthe gear 12 in the opposite direction; the direction of rotation ofthese gears, in the particular embodiment of the invention illustrated,being indicated by the arrows in Fig. 1. If the velocity of the deviceof which the speed is to be determined becomes steady or uniform, thepinion 13 will remain stationary. If this velocity increases, the pinion13 will travel in the direction of the motor, and will by means of thesegmental gear 15, bar 16 and frame 18, shift the friction-wheel 20outwardly toward the circumference of the gcar-wheel 12, and at the sametime move the friction-wheel 20 toward the center of the gear 12 therebycompensating for this increase in speed, and again bring the gears 12and 12 to a unlform movement. If the speed of the device decreases, thereverse operation obviously takes place, and the gears again assume thesame angular velocity.

The circumferential position of the pinion I 13 accordingly measures therelationship between the speed of the motor and the s eed of the deviceto which the indicator is app 'ed, and since the shafts 14 and 7, andthe hand 8, are rigidly attached, the speed of the device will beobserved by looking at the position of the hand on the dial; the latterof course being graduated in any suitable units. Should the device whichis being tested, stop, the

pinion 13 would move in adirection to project the rock-bar intoengagement with the art, of the motor, and

moving wheel, or

y bring the motor to a claim as new and desire to secure by LettersPatent:

-1. In a s eed indicator, a motor, means adapted to be driven by thedevice of which the speed is to be determined, indicating meanseratively connected with the motor and wit the first mentioned means,and means for stopping the motor actuated by the indicating means.

- 2. Ina s eed indicator, two opposed revolublemem ers, avthird memberin engagement with said members, friction-wheels in contact with theouter faces of said opposed members adapted to drive them in oppositedirections, and means controlled by the third member for shifting thewheels in reverse dimotionswith respect to the centers of said members.

3. In a speed indicator, twoopposed mem bers ada ted to be driveninopposite directions, a tliird member located between and in operativeengagement with both of said members, means operated byasaid thirdmember for automatically maintaining'the speeds of the first two memberssubstantially uniform, and an indicating device actuated by the thirdmember.

4. In a speed'indicator, two opposed members, a third member in oerative engagement with said members, fi ictionwheels in contact withthe outer faces of said opposed members, and means actuated by thethirdmember for shifting said friction-wheels to maintain said members at thesame speed.

5. In a speed indicator, two opposed members, a third member inoperative engage ment with both of said members, and means formaintaining said opposed members at the same speed, automaticallycontrolled by the third member.

6. In a speed indicator, twoopposed mem bers, a third member inoperative engagefor maintaining the speed of said opposed by said thirdmember.

members substantially the same,-controlled 7. In a speed indicator, amotor, two opposed members, one of which is driven by the motor meansfor driving the other member by the device of which the speed is to bedetermined, a third member 1n operative engagement with said opposedmembers, and means controlled by said third member for maintaining thesaid members at the same speed. I

8. In a speed indicator, a motor, two'opposed members, one of which isdriven by the motor, meansfor driving the other member by the devicelofwhich the speed is to be determined, a third member 1n operativeengagement with said opposed members, and

means actuated by'the third member for stopping the motor. a

.9; In a speed indicator, two opposed rev-. oluble members, a thirdmember operatively engaged with'both of said members, a frame,

friction-wheels in contact with the outer faces of said opposed membersand carried by said frame, and means controlled by said thirdmember forshifting the frame.

10." In a speed indicator, two opposed gears, an intermediate pinion inmesh with said gears, means controlled by said pinion for maintainingthe gears at the same speed, and indicating means actuated by thepinion.

11. In a speed indicator, a shaft, two 0 posed gears 'ournaled on theshaft, a ra ially-arranged shaft secured to the firstnamed shaft betweensaid gears, a pinion j ournaled on the radially-arranged shaft, meansactuated by the pinion throu h said radially-arranged shaft formaintaining the gears at substantially the same speed, and a pointercarried by the first mentioned shaft. 12.- .Ina speed indicator, twoopposed Wheels, a third wheel intermediate said Wheels andin operativeenga ement there with, a pointer actuated by t emovement of the thirdwheel about the circumferences of the two opposed wheels, a'slidableframe,

friction-wheels in contact with the outer faces of said wheels andcarried by said frame, and means for sliding the frame by the movementof the third wheel about the circumferences of the two opposed wheels.

13. 1 In a speed indicator, ashaft having a pointer attached .thereto,two 0 posed wheels j ournaled on the shaft, a thir wheel inoperativeengagement with the two. op- -posed wheels and carried by said shaft, aframe, friction-wheels carried by the frame and in contact with the sidefaces of the o iprosed wheels, and means for shifting t e ame tomaintain the opposed wheels at the same speed, controlled by themovement of the third wheel about the circumferences of the opposedwheels.

14. In a speed indicator, a shaft, two opposed wheels journaled on theshaft, a pointer carried by the shaft, a third wheel carried on theshaft in operative engagement with the two opposed wheels for actuatingthe pointer,

. friction-wheels in contact with the side faces of the opposed wheels,and means controlled by the third wheel for shifting the frictionwheelsin reverse directions w1th respect to said shaft, whereby the twoopposed wheels are maintained at the same speed.

15. In a speed indicator, a shaft having a pointer secured thereto, twoopposed gearwheels journaled on the shaft, a second, shaft secured tothe first mentioned shaft intermediate said wheels and having asegmental the pinion travels about the circumferences of the two opposedgears.

In testimony whereof I have signed my name to 'this'specification, inthe presence of two subscribi n witnesses.

J HN GERHARD FIELD,

Witnesses:

H. J. Brown, W. O. HANSON.

